Reinforced rubber band Available in 4 strengths Comes in a pack of 10 so you can use it by your team. *The size of the load varies depending on the color. Blue Width 3.0cm x Length 27.5cm x Thickness 1.6mm / Number of Pieces: 10 / Level: X-HEAVY Rubber bands for shoulder blades and hip joint exercises. 10 per bag for team use In addition to red with a slightly lighter load strength, there are 4 levels of load strength. From rehabilitation to strength training, choose according to your purpose.